T1235H-8G

Triacs Overview

The T1235H-8G is a medium current Triac from STMicroelectronics, housed in a D2PAK surface-mount package. It features an 800 V symmetrical blocking voltage and a rated RMS on-state current of 12 A. The device supports a maximum junction temperature (Tj) of 150°C, enabling operation in high-temperature environments. Key electrical parameters include a maximum gate trigger current (Igt) of 35 mA, a maximum gate trigger voltage (Vgt) of 1.3 V, and a peak on-state voltage of 1.55 V. It exhibits a non-repetitive surge current rating of 126 A and a maximum holding current of 35 mA. The component operates within a temperature range of -40°C to +150°C.

Triacs Feature Summary

• Based on ST Snubberless high temperature technology for robust dynamic turn-off commutation and high noise immunity up to Tjmax.
• Designed for compact drive of AC loads with enhanced thermal management via the D2PAK package.
• Capable of controlling universal motors, heaters, and inductive loads without requiring external snubber RC circuits when limits are respected.

Triacs Applications

• Industrial control systems
• Home appliances
• General purpose mains power AC switching

Triacs Procurement Notes

Verify the specific suffix 'G' corresponds to the RoHS-compliant, halogen-free ECOPACK2 version. Confirm the package type is D2PAK (TO-263) and not TO-220AB or other variants. Ensure the datasheet matches the 800V rating and 150°C junction temperature specifications before integration into designs requiring high-temperature reliability.

Triacs Selection Notes

Select this component for applications requiring surface-mount assembly with high thermal performance. The 150°C junction temperature capability allows for reduced heatsink size compared to standard 125°C devices. Ensure the driving circuit can provide at least 35 mA gate current. Verify that the load characteristics do not exceed the 126 A surge current limit during startup or fault conditions.

Triacs Part Context

This part belongs to the T12xxH series of Triacs, which are designed for general-purpose mains power AC switching. The H-series distinguishes itself with a 150°C maximum junction temperature and Snubberless technology. The T1235H-8G specifically offers 12 A current handling in a compact SMD package, differentiating it from through-hole versions like the T1235H-8I or lower-current variants.

Triacs Replacement Considerations

Public confirmed substitutes include T1235H-8I (TO-220AB insulated) and T1235T-8G (D2PAK, same family). Direct pin-compatible SMD replacements must be verified against the 12A/800V/150°C specification matrix.